Composition for use in producing metal castings.



UNTTE ST TES Patented June 2, 190a.

PATENT @FFICE.

CALVIN \V. LINK, OF JERSEY CITY, NEW JERSEY.

SPECIFICATION forming part of Letters Patent No. 729,617, dated June 2, 1903.

Application filed January 5,1903. Serial No. 137,898. (No specimens.)

To all whom it may concern.-

Be it known that I, CALVIN WV. LINK, a citizen of the United States, and a resident of Jersey City, in the county of Hudson and State of New Jersey, have invented a new and useful Composition for Use in Producing Metal Castings, of which the following is a full, clear, and exact specification. My invention relates to compositions of that class commonly availed of in the production of molds, cores, and the like, the latter being employed in the operation of casting metals; and it relates more particularly to compositions of special utility in the operation of producing articles and objects from iron by the process of casting.

My invention consists in comminglin g a silica, a vegetable oil, and a hydrocarbon oil, the vegetable oil predominating over the 11ydrocarbon oil; and its object is to provide a composition of the class indicated which shall be capable of insuring clean and uniform surfaces for the products in connection with the casting of which it is used, which shall be adapted to obviate the so-called blowing of the metal during the process of casting, which shall embody inexpensive and readilyobtainable ingredients," and which shall possess advantages over prior analogous compositions.

In carrying out my invention 1 make use of a silica, preferably in the form of so-called shore sand. The silica is placed in a suitable receptacle in readiness for receiving the oil mixture which I make use of. This oil mixture comprises as ingredients a vegetable oil and a hydrocarbon oil. When the vegetable oil and the hydrocarbon oil shall have been combined, a quantity of the-resultant mixture is sprayed or otherwise distributed upon the silica, and the entire mass is then agitated for the purpose of subjecting as fully as practicable each separate element of the silica to the action of said mixture, said silica elements accordingly receiving each a coating of the mixture. In practice the sand should constitute mainly the entire mass, and in the oil mixture the vegetable oil should predominate over the hydrocarbon oil employed, and I have found the following proportions substantially to be particularly advantageous: silica or sand, ninety-nine per cent., vegetable oil, three-quarters of one per cent, and hydrocarbon oil one-quarter of one per cent.

As to the vegetable oil employed 1 have found that commercially known as corn-oil to be exceptionally serviceable, and for the hydrocarbon oil specified as constituting an element of my improved composition I make use of a product of petroleum, such as refined high-test kerosene. The corn-oil serves with marked efficiency as a binder, as in like quantities it yields a less volume of gas under the application of heat than binders heretofore made use of, and accordingly such gas may be conducted away by means of a vent lesser than is ordinarily required where other binders are used.

The hydrocarbon oil is employed for the purpose of insuring complete combustion of the binder availed of, and the composition herein set forth as a whole is such that when embodied in cores and the like practically no blowing effect in the metal being cast takes place in the process of casting.

To insure a thorough distribution of the oil mixture over each separate element of the sand, the oil mixture having been applied'to the sand the entire mass may then be passed one or more times through a screen of suitable mesh. Thereafter, the mass having been brought to a proper consistency, it is placed in a former or core-box and the core or object thus produced is baked or subjected to the action of heat in the usual manner.

lVhile linseed and other vegetable oils may be employed, corn-oil is the most desirable and may be had in the market at less cost, and the sand employed need not necessarily be new sand, as fifty per cent. of it may be old sand or sand that has been previously used. The oil mixture being consumed in the proccess of casting, the sand is left free and suitable for further service.

Where the composition herein set forth is employed in the production of cores and the like in the process of casting, such cores being used for the purpose, the iron lies free from the core, no appreciable blowing effect takes place, the generated gases readily escape, and the proportion of mixture to the sand employed is much less than ordinarily required where other mixtures are availed of.

Having thus described my invention and its advantages, What I claim asv new, and desire to secure by Letters Patent, is-

1. A composition for use in producing metal castings, consisting of silica, corn-oil and a 5 petroleum product, substantially as herein specified. I

2. A composition for use in producing metal castings, consisting of silica, cornoil and hydrocarbon oil, the corn-oil predominating,

10 over the hydrocarbon oil, substantially as herein specified. 

